fix(stitch): handle nested dependencies in computed fields

[ardatan]

Handle nested dependencies in the computed fields

{
  merge: {
    Product: {
      selectionSet: '{ id }',
      fields: {
        isExpensive: {
          selectionSet: '{ price }',
          computed: true,
        },
        canAfford: {
          selectionSet: '{ isExpensive }',
          computed: true,
        },
      }
    }
  }
}

[changeset-bot]

🦋 Changeset detected

Latest commit: d99a083

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@graphql-tools/stitch	Patch
federation-benchmark	Patch

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[github-actions]

🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
@graphql-tools/stitch	9.2.9-alpha-20240514131506-d99a083d94101651043d49cb169e8439eb6722ed	npm ↗︎ unpkg ↗︎

[github-actions]

✅ Benchmark Results

     ✓ no_errors
     ✓ expected_result

     checks.........................: 100.00% ✓ 338       ✗ 0  
     data_received..................: 39 MB   3.9 MB/s
     data_sent......................: 145 kB  14 kB/s
     http_req_blocked...............: avg=4.12µs   min=2.06µs   med=2.65µs   max=204.27µs p(90)=3.76µs   p(95)=3.96µs  
     http_req_connecting............: avg=893ns    min=0s       med=0s       max=151.08µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=55.18ms  min=46.65ms  med=51.39ms  max=153.77ms p(90)=63.57ms  p(95)=87.92ms 
       { expected_response:true }...: avg=55.18ms  min=46.65ms  med=51.39ms  max=153.77ms p(90)=63.57ms  p(95)=87.92ms 
     http_req_failed................: 0.00%   ✓ 0         ✗ 169
     http_req_receiving.............: avg=131.52µs min=104.26µs med=126.18µs max=409.18µs p(90)=144.96µs p(95)=155.04µs
     http_req_sending...............: avg=24.69µs  min=19.44µs  med=23.34µs  max=63.73µs  p(90)=29.26µs  p(95)=33.97µs 
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=55.02ms  min=46.5ms   med=51.24ms  max=153.4ms  p(90)=63.42ms  p(95)=87.76ms 
     http_reqs......................: 169     16.868586/s
     iteration_duration.............: avg=59.26ms  min=50.03ms  med=55.38ms  max=159.01ms p(90)=67.05ms  p(95)=91.55ms 
     iterations.....................: 169     16.868586/s
     vus............................: 1       min=1       max=1
     vus_max........................: 1       min=1       max=1

[github-actions]

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